The Kalamazoo KB bass guitar was shipped from 1966, up until 1969. This vintage Kalamazoo bass comes from the first year of production, 1966 and has the offset Fender Mustang body style. This changed to the more familiar SG style towards the end of the decade. See a 1967 SG-styled KB1 bass.
Despite having almost identical hardware, the 1966 US zone 1 price for the Kalamazoo KB1 bass was $119.50, compared to $240 for the equivalent Gibson EB-O. The bodies were produced out of Masonite by a third party manufacturer in Wisconsin, and there was no skilled assembly required. Gibson had taken a leaf out of Fender's book in producing a bass that could be bolted together in a very short time by unskilled labour. They were produced at Gibsons plant II (416E Ransom street, rather than the main plant, 225 Parsons street) which was where pickups and electronics were produced.
The combination of cheap price, and quality Gibson components made these popular guitars, selling well in 1966 and 1967. White was by far the best selling colour of 1966 (see Kalamazoo KB bass shipping stats); this bass is one of 1347 white KB basses shipped that year.
Be sure to listen to the Kalamazoo KB bass soundclips here.